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SVTPerformance's Chain of Restaurants
Road Side Pub
Restrictor plate math help
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<blockquote data-quote="AustinSN" data-source="post: 16628415" data-attributes="member: 159453"><p>Long story short, my road racing car makes too much power for it's class. I need to lose anywhere from 11-15whp.</p><p></p><p>I asked another guy for some help on restrictor plate sizing, he gave me info on his LT1, which has a twin 48mm TB, and putting a 40mm restrictor plate knocked it down 15hp. A surface area decrease of around 30.6%. </p><p></p><p>My car (98 Cobra) has twin 57s, following the same reduction in surface area puts the restrictor at 47.5mm at the TB. If my math is off on that, someone let me know.</p><p></p><p>Here is the problem, I want to put the restrictor further down in the intake where it is a circle instead of an oval (leading into the twin ports). I measured the ID of the intake after the MAF and it's 91mm. If I put a 63mm donut in the pipe (30.6% decrease), could that potentially put me in a similar position? I did crunch the numbers and it looks like twin 47.5mm restrictors put the single large restrictor at 67mm by area. </p><p></p><p>I'm going to have my wife's parents who have a 3D printer make up probably 5 different sizes that I can swap out to get the power where I want it but the longer it spends making pulls on the dyno, the more it will cost me. So getting it close on the first shot is preferred. I'm not even sure where to start, or if I'm even close. </p><p></p><p>Thanks.</p></blockquote><p></p>
[QUOTE="AustinSN, post: 16628415, member: 159453"] Long story short, my road racing car makes too much power for it's class. I need to lose anywhere from 11-15whp. I asked another guy for some help on restrictor plate sizing, he gave me info on his LT1, which has a twin 48mm TB, and putting a 40mm restrictor plate knocked it down 15hp. A surface area decrease of around 30.6%. My car (98 Cobra) has twin 57s, following the same reduction in surface area puts the restrictor at 47.5mm at the TB. If my math is off on that, someone let me know. Here is the problem, I want to put the restrictor further down in the intake where it is a circle instead of an oval (leading into the twin ports). I measured the ID of the intake after the MAF and it's 91mm. If I put a 63mm donut in the pipe (30.6% decrease), could that potentially put me in a similar position? I did crunch the numbers and it looks like twin 47.5mm restrictors put the single large restrictor at 67mm by area. I'm going to have my wife's parents who have a 3D printer make up probably 5 different sizes that I can swap out to get the power where I want it but the longer it spends making pulls on the dyno, the more it will cost me. So getting it close on the first shot is preferred. I'm not even sure where to start, or if I'm even close. Thanks. [/QUOTE]
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SVTPerformance's Chain of Restaurants
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Restrictor plate math help
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